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Why Telecom have -48V DC power supply?

+6 votes

Why there is a negative sign for a voltage supply ? it indicates what ?

posted Feb 12, 2014 by Iti Jindal

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1 Answer

+2 votes

Negative sign indicates the positive grounded
The negative voltage on the line was better than positive.

Negative voltage prevents the Electro-chemical reactions from destroying the copper cable quickly, if cables get wet it will be low enough not to cause any serious danger if somebody touch the telephone wires.

I guess this is the reason why telecom has negative DC voltage.

answer Feb 13, 2014 by Hiteshwar Thakur
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